Royal Canin Veterinary - Diabetic DS 46 - cat dry food

I specifically bought this food because my vet recommended it, but unfortunately my cat just can’t tolerate it at all… Normally she eats absolutely everything… The ingredients actually look really good, so I just don’t get it. I bought a different one locally before this arrived and had no issues with that. Maybe the food pieces are too big? I tried it for three days… but unfortunately it kept coming back up whole every time… Since I switched back to the other food, no problems at all… Such a pity :[